Numerical simulations of soil physicochemistry and aeration influences on the external corrosion and cathodic protection design of buried pipeline steels

Gadala, Ibrahim M.; Wahab, Magd Abdel; Alfantazi, Akram

doi:10.1016/j.matdes.2016.02.089

Cited by 60 publications

(20 citation statements)

References 30 publications

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“…As the anodic scan progresses, the current rises sharply from −1.375 mA at −1.2 V SCE to −231 μA at −1.06 V SCE and steadily increases to zero at −937 mV SCE , as the hydrogen evolution reaction (HER) induced by water reduction controls the electrode process and increases the local alkalinity [ 47 , 48 ]. At a higher scan potential, the liberation of ferrous ions through anodic dissolution is gradually driven by the migration of OH − and water molecules, resulting in the mitigation of cathodic predominance [ 49 , 50 ]. However, the electrode process remains under cathodic control, although the mechanism of the cathodic reaction transforms into the slower reduction of bicarbonate, producing carbonate and adsorbed hydrogen atoms [ 48 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Wang

et al. 2017

Materials

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This study employs potential-monitoring techniques, cyclic voltammetry tests, alternating current (AC) voltammetry methods, and surface characterization to investigate the AC corrosion of cathodically protected X80 pipeline steel. In a non-passive neutral solution at pH 7.2, a sufficiently negative potential completely protects steel at an AC current density of 100 A/m2. In an alkaline solution at pH 9.6, more serious AC corrosion occurs at more negative cathodic protection (CP) potential, whereas without CP the steel suffers negligible corrosion. In addition, the interface capacitance increases with AC amplitude. Based on these results, the AC corrosion mechanisms that function under various conditions are analyzed and described.

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Section: Resultsmentioning

confidence: 99%

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Wang

et al. 2017

Materials

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“…Similar values typical for cathodic protection installations in Germany are usually less than 10 amperes with a much larger area of the protected surface of the underground pipeline [10, p. 162]. Explicitly overestimated values of protective currents in cathodic protection practice in Russia made it necessary to analyze this phenomenon and develop measures to reduce them, which caused a whole series of works, specifically devoted to this problem [12][13][14][15][16].…”

Section: Determination Of the Protective Current For Pipelines Of Heamentioning

confidence: 99%

Features of Russian regulatory framework governing cathodic protection of heating networks against external corrosion in the ground

et al. 2019

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A comparative analysis of domestic and foreign documents governing the design of cathodic protection systems has been carried out. The main parameters for evaluating the effectiveness were selected: “protective current density”, “protective current value” and “indicators characterizing the degree of protection against corrosion in the presence of cathodic protection”. As a result, the need for improving the domestic system for designing cathodic protection installations was established. First of all, attention should be paid to the decrease in protective current, protective current density and criteria for determining the need for cathodic protection.

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“…In continues, the corrosion mapping and development of an electrochemical potential and current distribution grid can be introduced as the helpful techniques. Ghadala et al 22 developed a finite element model for the external corrosion of buried steel pipelines at coating failures in order to anticipate the coating degradation among various soil and cathodic protection (CP) conditions. Also, the interactions between different important factors, including steadystate temperature, potential, and oxygen concentration profiles in the soil surrounding the pipeline structure were determined.…”

Section: Corrosion Monitoring Techniquesmentioning

confidence: 99%

The Application of Finite Element Analysis as a New Approach in Corrosion and Integrity Assessment Programs

Zaferani¹

2017

IPCSE

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Structural integrity assessment procedures are interesting areas in many industrial plants, e.g., oil and gas, and petrochemical for ensuring the safety and economy of an operating sector. The remaining strength of components (e.g. pipelines, risers) with corrosion defects is a prevalent project in the oil and gas industry, and it has been investigated for years via using experimental, numerical and analytical methods. Obtaining the stress distribution in the vicinity of corrosion defects is a decisive phase in understanding the structural integrity of corroded components under high internal pressure. In the corrosion based management programs, finite element analysis (FEA) can provide valuable results in the integrity assessment. Also, FEA can be applied to corrosion monitoring of structures by considering different parameters such as protecting current distribution, electrochemical potential grid and coating degradation. This research discusses the application of FEA in the corrosion and integrity assessment process based on three areas including, in-service performance of corroded parts, repairing methods and corrosion monitoring techniques.

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Numerical simulations of soil physicochemistry and aeration influences on the external corrosion and cathodic protection design of buried pipeline steels

Cited by 60 publications

References 30 publications

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Features of Russian regulatory framework governing cathodic protection of heating networks against external corrosion in the ground

The Application of Finite Element Analysis as a New Approach in Corrosion and Integrity Assessment Programs

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